53 lines
No EOL
1.4 KiB
GLSL
53 lines
No EOL
1.4 KiB
GLSL
/*
|
|
contributors: Patricio Gonzalez Vivo
|
|
description: Signed Random
|
|
use: srandomX(<vec2|vec3> x)
|
|
license:
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
|
|
*/
|
|
|
|
#ifndef FNC_SRANDOM
|
|
#define FNC_SRANDOM
|
|
|
|
float srandom(in float x) {
|
|
return -1. + 2. * fract(sin(x) * 43758.5453);
|
|
}
|
|
|
|
float srandom(in vec2 st) {
|
|
return -1. + 2. * fract(sin(dot(st.xy, vec2(12.9898, 78.233))) * 43758.5453);
|
|
}
|
|
|
|
float srandom(in vec3 pos) {
|
|
return -1. + 2. * fract(sin(dot(pos.xyz, vec3(70.9898, 78.233, 32.4355))) * 43758.5453123);
|
|
}
|
|
|
|
float srandom(in vec4 pos) {
|
|
float dot_product = dot(pos, vec4(12.9898,78.233,45.164,94.673));
|
|
return -1. + 2. * fract(sin(dot_product) * 43758.5453);
|
|
}
|
|
|
|
vec2 srandom2(in vec2 st) {
|
|
const vec2 k = vec2(.3183099, .3678794);
|
|
st = st * k + k.yx;
|
|
return -1. + 2. * fract(16. * k * fract(st.x * st.y * (st.x + st.y)));
|
|
}
|
|
|
|
vec3 srandom3(in vec3 p) {
|
|
p = vec3( dot(p, vec3(127.1, 311.7, 74.7)),
|
|
dot(p, vec3(269.5, 183.3, 246.1)),
|
|
dot(p, vec3(113.5, 271.9, 124.6)));
|
|
return -1. + 2. * fract(sin(p) * 43758.5453123);
|
|
}
|
|
|
|
vec2 srandom2(in vec2 p, const in float tileLength) {
|
|
p = mod(p, vec2(tileLength));
|
|
return srandom2(p);
|
|
}
|
|
|
|
vec3 srandom3(in vec3 p, const in float tileLength) {
|
|
p = mod(p, vec3(tileLength));
|
|
return srandom3(p);
|
|
}
|
|
|
|
#endif |